EP3532424B1 - Zusammenlegbarer kran - Google Patents

Zusammenlegbarer kran Download PDF

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Publication number
EP3532424B1
EP3532424B1 EP17829057.3A EP17829057A EP3532424B1 EP 3532424 B1 EP3532424 B1 EP 3532424B1 EP 17829057 A EP17829057 A EP 17829057A EP 3532424 B1 EP3532424 B1 EP 3532424B1
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EP
European Patent Office
Prior art keywords
arm
attachment point
crane
lever element
lift
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17829057.3A
Other languages
English (en)
French (fr)
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EP3532424A1 (de
Inventor
Branko Gril
Boris JERMAN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tajfun LIV Proizvodnja In Razvoj doo
Original Assignee
Tajfun LIV Proizvodnja In Razvoj doo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Tajfun LIV Proizvodnja In Razvoj doo filed Critical Tajfun LIV Proizvodnja In Razvoj doo
Priority to HRP20220306TT priority Critical patent/HRP20220306T1/hr
Priority to PL17829057T priority patent/PL3532424T3/pl
Priority to RS20220253A priority patent/RS63016B1/sr
Publication of EP3532424A1 publication Critical patent/EP3532424A1/de
Application granted granted Critical
Publication of EP3532424B1 publication Critical patent/EP3532424B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/54—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
    • B66C23/545—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors with arrangements for avoiding dead centre problems during cylinder motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks

Definitions

  • the object of the invention is a foldable crane, preferably a truck mounted crane including a crane base, i. e. a rotatable column, on which a lift arm is pivotally mounted, and a lift and articulated arms that are connected to each other through a rotatable coupling to move on the same plane.
  • the articulated arm can be in the form of a tube, in which a telescopic articulated arm can be arranged.
  • a hydraulic system is used for driving the articulated arm with respect to the lift arm.
  • the hydraulic system operated between the lift arm and the articulated arm which contains at least one piston hydraulic cylinder attached laterally with respect to the lift and articulated arms.
  • the crane preferably contains two piston hydraulic cylinders which are attached symmetrically with respect to the longitudinal axis of symmetry and laterally with respect to the lift and articulated arms.
  • the piston hydraulic cylinder is mounted on one side to a lever system and on the other side directly to the lift arm.
  • the rotatable column, the lift arm and the articulated arm are arranged in a Z-shape in the folded state of the crane; the articulated arm is folded above the lift arm.
  • the characteristics of the crane i. e. its maximum working range and preservation of sufficient torque and force for lifting a load when the lift and articulated arms are in an extended position, are defined by its dimensions. Given the existing dimensions of the crane base, the lift and articulated arms, the horizontal reach of the crane should desirably extend to a maximum, while the crane should preserve sufficient torque and force for lifting a load. It is further desirable that the articulated arm is folded above the lift arm when the crane is in a folded state.
  • Foldable cranes are known from prior art, in which a lift and articulated arms are pivotally connected between each other and wherein a hydraulic cylinder is attached with one of its ends directly to the lift arm and with another of its ends directly to the articulated arm. All these cranes have limitations as to their maximum horizontal reach and limitations relating to providing sufficient force and torque for lifting a load when the crane is in the most loaded position, i. e. when the lift arm is in the horizontal position and the articulated arm approaches a dead centre or is in the dead centre.
  • the dead centre is a position, in which the longitudinal axis of the hydraulic cylinder overlaps with the connecting point between the lift arm and the articulated arm. This is simultaneously the most extended position of the articulated arm with respect to the lift arm.
  • the reach of the lift and articulated arms comes closest to its maximum value.
  • a piston rod of the hydraulic cylinder comes closer to the attachment axis of the lift and articulated arms, which results in the fact that the crane in its extended position lacks sufficient power for lifting a load.
  • For the crane to have a sufficient force for lifting a load a certain distance needs to be available between the longitudinal axis of the piston hydraulic cylinder or its piston rod and the attachment axis of the lift and articulated arms. The length of this distance defines the torque and force of the crane and indirectly also the maximum horizontal reach of the crane. If we want that sufficient force for lifting a load is preserved, the crane in its operating position should not reach the dead centre, i. e. the lift and articulated arms should not extend to their maximum and this means a shorter reach of the crane.
  • EP patent No. 1770050 describes a foldable crane, in which a hydraulic cylinder is attached with one of its ends to a lift arm and with another of its ends directly to an articulated arm.
  • a solution is proposed that includes an articulated arm configured as a tube, in which a telescopic arm is mounted in a displaceable manner, wherein the working area of the articulated arm for moving the telescopic arm extends to the articulated connection of the articulated arm with the lift arm.
  • an increased outreach of the crane is reached by extending the space in the articulated arm, such that the length of the telescopic arm which is arranged within the articulated arm can be longer.
  • EP patent No. 2683645 discloses a foldable crane, in which an articulated arm includes a telescopic arm for reaching a longer reach of the working area of the crane.
  • An additional hydraulic cylinder 6 is used for extending and retracting the telescopic arm, wherein one end of the hydraulic cylinder 6 is attached to the telescopic arm in a way that heavier loads may be lifted with the telescopic arm being extended in order to avoid deformation.
  • Figure 1 shows a set of levers between the lift and articulated arms, wherein a hydraulic piston cylinder 10 is centrally attached with one end in the lift arm and the articulated arm cannot be folded above the lift arm.
  • EP patent No. 066567 described a foldable crane that discloses a set of levers between the lift and articulated arms, wherein the set of levers allows folding the articulated arm below the lift arm and the lift arm is positioned transversely with respect to the crane frame.
  • the hydraulic piston cylinder is attached with one of its ends to the articulated arm and with another of its ends to the lift arm through a set of levers, which means that the entire mass of the hydraulic piston cylinder is on the articulated arm.
  • the articulated arm can be only folded below the lift arm.
  • Foldable cranes are also disclosed in WO 92/04270 A1 , WO 98/17576 A1 , EP 2 683 645 A1 and EP 2 789 566 A1 .
  • EP 2 248 753 A1 discloses a foldable crane according to the preamble of claim 1.
  • the foldable crane of the invention includes an additional set of levers belonging to each piston hydraulic cylinder.
  • the set of levers consists of two lever elements whose first ends are pivotally connected with the piston hydraulic cylinder and to each other; one lever element is simultaneously pivotally connected with the lift arm with its second end, while the second lever element is pivotally connected with the articulated arm with its second end.
  • the hydraulic piston cylinder is pivotally attached with one of its ends to the lift arm, while it is attached to the articulated arm through a set of levers.
  • the crane contains two piston hydraulic cylinders, which are positioned symmetrically with respect to the axis of symmetry of the arms and laterally with respect to the lift and articulated arms at each side of the crane.
  • the two sets of levers are connected with each other through a linking element via rotatable mounting that connects both lever elements with the piston hydraulic cylinder. A stiffer set of levers is herewith achieved.
  • Such attachment of the hydraulic cylinder to the lift and articulated arms still preserves a sufficient distance d between the longitudinal axis of the piston hydraulic cylinder or its piston rod and the attachment axis of the lift and articulated arms.
  • the crane still has sufficient torque and lifting force of the crane in a position, in which the working outreach of the lift and articulated arm assembly is maximum.
  • the crane of the invention never reaches the dead centre in its working position.
  • the lever elements are attached at the lateral side of the articulated arm, the inner space of the articulated arm for receiving a telescopic arm is not additionally restricted and the telescopic arm can extend along the entire internal length of the articulated arm; in other words, the length of the telescopic arm is only limited by the position of the attachment of the lift and articulated arms. Moreover, such attachment of the piston hydraulic cylinder to the lift and articulated arms allows the articulated arm to fold above the lift arm and the crane has a Z-shape when folded.
  • the foldable crane of the invention has a considerably improved functionality as the torque and power of the crane are increased at the maximum working outreach of the crane. This allows lifting of heavier loads and lifting loads higher; at a given load capacity the maximum working outreach of the crane is increased.
  • a further advantage lies in the fact that the articulated arm is more easily lifted by a heavier gripper in order to bring the crane from or into a working position.
  • the dead centre of the crane, when the articulated arm is folded above the lift arm, can be overcome by gravity, i. e. by the weight of the articulated arm.
  • the foldable crane shown in the figures includes a rotatable column 12, to which a lift arm 1 is pivotally mounted through an attachment point 13, an articulated arm 2, in which a telescopic arm 11 can be arranged, wherein the lift arm 1 and the articulated arm 2 are pivotally connected with each other in known ways via attachment point 3, a piston hydraulic cylinder 4 that operates between the lift arm 1 and the articulated arm 2, and a set of levers consisting of a first lever element 5 that has two ends 5a, 5b and a second lever element 6 that has two ends 6a, 6b.
  • the first lever element 5 and the second lever element 6 are pivotally connected to each other through their first ends 5a and 6a in known ways via attachment point 9.
  • the articulated arm 2 is centrally mounted to the lift arm 1.
  • the piston hydraulic cylinder 4 is connected to the attachment point 9 with its end 4b, while it is pivotally connected with its end 4a in known ways with the lift arm 1 via attachment point 7.
  • the first lever element 5 is connected with its end 5b in known ways with the lift arm 1 via attachment point 8.
  • the second lever element 6 is connected with its end 6b in known ways with the articulated arm 2 via attachment point 10.
  • the foldable crane contains two piston hydraulic cylinders 4 which are positioned symmetrically with respect to the longitudinal axis of symmetry and laterally with respect to the lift 1 and articulated arm 2 at each side of the crane, wherein each piston hydraulic cylinder 4 includes a belonging set of levers.
  • the sets of levers are pivotally connected with each other by a linking element 14 via attachment point 9 which connects both lever elements with the piston hydraulic cylinder 4.
  • the first lever element 5 is longer than the second lever element 6.
  • a ratio of the lengths of the first lever element 5 and the second lever element 6 impacts the lifting power of the crane and the crane's kinematics, i. e. the minimum angle ⁇ which can be reached between the lift arm 1 and the articulated arm 2 when the crane is in the bottommost point in the working position, the maximum working reach of the crane, and the torque of the crane, i. e. the length of the distance d.
  • the length of the first lever element 5 is at least twice the length of the second lever element 6, the length of the first lever element 5 is preferably at least three times longer than the length of the second lever element 6.
  • the ratios between the length of the piston cylinder 4 and the first 5 and second lever elements 6 are also defined by the distances x, y and z.
  • the distance x between the attachment point 3 of the lift arm 1 with the articulated arm 2 and the attachment point 7 of the end 4a of the hydraulic piston cylinder 4 with the lift arm 1 must exceed the distance y between the attachment point 3 of the lift arm 1 with the articulated arm 2 and the attachment point 10 of the end 6b of the second lever element 6 with the articulated arm 2, wherein the distance z between the attachment point 3 of the lift arm 1 with the articulated arm 2 and the attachment point 8 of the end 5b of the first lever element 5 with the lift arm 1 must be smaller than the distance x and smaller than the distance y, the distance z is preferably as small as possible.
  • the attachment point 8 of the end 5b of the first lever element 5 with the lift arm 1 and the attachment point 3 of the lift arm 1 with the articulated arm 2 are positioned along the lift arm 1, wherein the attachment point 8 is positioned with respect to the attachment point 3 closer to the rotatable column 12.
  • the attachment point 10 of the end 6b of the second lever element 6 with the articulated arm 2 is positioned on the articulated arm 2 and distant from the attachment point 3 in a direction towards the load attachment.
  • the attachment point 9 which connects both lever elements with the piston hydraulic cylinder 4 is always located below the attachment point 10 of the end 6b of the second lever element 6 with the articulated arm 2.
  • the maximum working outreach of the crane is yet further increased, the crane has higher carrying capacity at the maximum working outreach since the crane does not reach the dead centre at its maximum working outreach.
  • the attachment point 9 is always located above the attachment point 10.
  • the articulated arm 2 can fold on the lift arm 1 and the crane has a Z-shape when folded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Tumbler Switches (AREA)

Claims (4)

  1. Zusammenlegbarer Kran, vorzugsweise LKW-Kran, der umfasst: eine drehbare Säule (12), an die über einen Befestigungspunkt (13) ein Hubarm (1) gelenkig montiert ist, einen Hubarm (1) und einen Gelenkarm (2), die über den Befestigungspunkt (3) gelenkig miteinander verbunden sind, und ein Hydrauliksystem, das zwischen dem Hubarm (1) und dem Gelenkarm (2) wirkt und zwei Zylinder (4) umfasst, die bezüglich der Längssymmetrieachse des Hubarms (1) und des Gelenkarms (2) symmetrisch angeordnet und bezüglich des Hubarms (1) und des Gelenkarms (2) beidseits des Krans seitlich angebracht sind,
    dadurch gekennzeichnet, dass jeder Hydraulikkolbenzylinder (4) einen zugehörigen Satz von Hebeln umfasst, und dass die beiden Hebelsätze durch ein Verbindungselement (14) über eine Gelenkbefestigung (9) verbunden sind, die die beiden Hebelelemente mit dem Hydraulikkolbenzylinder (4) verbindet, und wobei jeder Hebelsatz aus einem ersten Hebelelement (5) mit zwei Enden (5a, 5b) und einem zweiten Hebelelement (6) mit zwei Enden (6a, 6b) besteht und erstes Hebelelement (5) und zweites Hebelelement (6) an ihren ersten Enden (5a) und (6a) über den Befestigungspunkt (9) aneinander angelenkt sind und das erste Hebelelement (5) an seinem Ende (5b) mit dem Hubarm(1) über den Befestigungspunkt (8) und das zweite Hebelelement (6) an seinem Ende (6b) mit dem Gelenkarm (2) über den Befestigungspunkt (10) gelenkig verbunden sind und der Hydraulikkolbenzylinder (4) mit einem Ende am Befestigungspunkt (9) an die Enden (5a, 6a) des ersten (5) und zweiten Hebelelements (6) angelenkt ist, während der zugehörige Kolbenzylinder (4) mit seinem zweiten Ende über den Befestigungspunkt (7) an den Hubarm (1) angelenkt und der Gelenkarm (2) mittig mit dem Hubarm (1) verbunden ist,
    und wobei das erste Hebelelement (5) länger ist als das zweite Hebelelement (6) und der Befestigungspunkt (9), der beide Hebelelemente (5, 6) mit dem Hydraulikkolbenzylinder (4) verbindet, unter dem Befestigungspunkt (10) des Endes (6b) des zweiten Hebelelements (6) mit dem Gelenkarm (2) liegt, wenn sich der Kran in Betriebsposition befindet, und der Befestigungspunkt (9) über dem Befestigungspunkt (10) liegt, wenn sich der Kran in zusammengelegter Position befindet,
    und wobei der Abstand (x) zwischen dem Befestigungspunkt (3) von Hubarm (1) und Gelenkarm (2) und dem Befestigungspunkt (7) des Endes (4a) des Hydraulikkolbenzylinders (4) und Hubarm (1) größer ist als der Abstand (y) zwischen dem Befestigungspunkt (3) von Hubarm (1) und Gelenkarm (2) und dem Befestigungspunkt (10) des Endes (6b) des zweiten Hebelelements (6) und Gelenkarm (2), und der Abstand (z) zwischen dem Befestigungspunkt (3) von Hubarm (1) und Gelenkarm (2) und dem Befestigungspunkt (8) des Endes (5b) des ersten Hebelelements (5) und Hubarm (1) geringer als der Abstand (x) und geringer als der Abstand (y) ist.
  2. Kran nach Anspruch 1, dadurch gekennzeichnet, dass das erste Hebelelement (5) zweimal so lang ist wie das zweite Hebelelement (6).
  3. Kran nach Anspruch 1, dadurch gekennzeichnet, dass das erste Hebelelement (5) mindestens dreimal so lang ist wie das zweite Hebelelement (6).
  4. Kran nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Gelenkarm (2) über dem Hubarm (1) zusammengelegt ist und der Kran in zusammengelegtem Zustand die Form eines Z hat.
EP17829057.3A 2016-10-25 2017-09-25 Zusammenlegbarer kran Active EP3532424B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
HRP20220306TT HRP20220306T1 (hr) 2016-10-25 2017-09-25 Sklopiva dizalica
PL17829057T PL3532424T3 (pl) 2016-10-25 2017-09-25 Żuraw nadający się do składania
RS20220253A RS63016B1 (sr) 2016-10-25 2017-09-25 Sklopivi kran

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SI201600266A SI25285B (sl) 2016-10-25 2016-10-25 Zložljivi žerjav
PCT/SI2017/000028 WO2018080403A1 (en) 2016-10-25 2017-09-25 Foldable crane

Publications (2)

Publication Number Publication Date
EP3532424A1 EP3532424A1 (de) 2019-09-04
EP3532424B1 true EP3532424B1 (de) 2021-12-15

Family

ID=60957425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17829057.3A Active EP3532424B1 (de) 2016-10-25 2017-09-25 Zusammenlegbarer kran

Country Status (8)

Country Link
EP (1) EP3532424B1 (de)
ES (1) ES2905851T3 (de)
HR (1) HRP20220306T1 (de)
PL (1) PL3532424T3 (de)
PT (1) PT3532424T (de)
RS (1) RS63016B1 (de)
SI (1) SI25285B (de)
WO (1) WO2018080403A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11731863B2 (en) 2019-12-24 2023-08-22 Reel Knuckle boom crane, for offshore application

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3339237B1 (de) * 2016-12-20 2020-07-22 Cargotec Patenter AB Hydraulikkran
SI26016B (sl) * 2020-06-19 2024-05-31 Tajfun Liv, Proizvodnja In Razvoj D.O.O. Nosilni sklop teleskopskega kraka pri mobilnem hidravličnem dvigalu in mobilno hidravlično dvigalo, obsegajoče tovrsten sklop

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2683645B1 (de) * 2011-03-10 2014-06-04 Palfinger AG Ladekran-ausleger
EP2248753B1 (de) * 2009-05-07 2016-07-06 EPSILON Kran GmbH. Kran mit Totpunktüberwindung
EP2789566B1 (de) * 2013-04-11 2019-07-10 HMF Group A/S Faltbarer Kran

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE466911B (sv) * 1990-08-29 1992-04-27 Hiab Ab Vipparmskran
SE507514C2 (sv) * 1996-10-18 1998-06-15 Lars Bruun Anordning vid hydrauliskt manövrerad lyftkran

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2248753B1 (de) * 2009-05-07 2016-07-06 EPSILON Kran GmbH. Kran mit Totpunktüberwindung
EP2683645B1 (de) * 2011-03-10 2014-06-04 Palfinger AG Ladekran-ausleger
EP2789566B1 (de) * 2013-04-11 2019-07-10 HMF Group A/S Faltbarer Kran

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11731863B2 (en) 2019-12-24 2023-08-22 Reel Knuckle boom crane, for offshore application

Also Published As

Publication number Publication date
HRP20220306T1 (hr) 2022-05-13
PL3532424T3 (pl) 2022-03-28
WO2018080403A1 (en) 2018-05-03
SI25285A (sl) 2018-04-30
RS63016B1 (sr) 2022-04-29
PT3532424T (pt) 2022-03-03
EP3532424A1 (de) 2019-09-04
ES2905851T3 (es) 2022-04-12
SI25285B (sl) 2022-10-28

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